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Good to know, thanks! Then does it remove a significant amount of heat as a real benefit, despite HD claiming a 100 degree egt reduction in the M8's, or is it best just to leave it alone? And re: the flattened crossover and disproportionate left vs right exhaust, same question, don't worry and leave alone or is that an area to change for improvement?
mjwebb, Your sickness is returning. What happen to leaving this one stock.
I have the stock pipe with street cannons. Just the right amount of noise for me.
When in the garage and cruising through the neighborhood it's nice and mellow.
Give it the goose getting on the freeway or passing or climbing a hill, she barks plenty loud for me.
IMO, you either start with a stock headpipe and free-breathing muffs. Then, if not loud enough, either replace the headpipe with a purposely designed one or do the "dig out the cat" on the stocker for more noise...not necessarily more performance...depends on build state.
Bob
mjwebb, Your sickness is returning. What happen to leaving this one stock.
i'm a effin' hypocrite. I fantasized about leaving this one alone, but at the end of the day I accepted that I always was and will be an adrenaline addict, even thinking about returning to vintage motocross racing after a few year hiatus. I miss working on bikes and wringing the snot out of them
i'm a effin' hypocrite. I fantasized about leaving this one alone, but at the end of the day I accepted that I always was and will be an adrenaline addict, even thinking about returning to vintage motocross racing after a few year hiatus. I miss working on bikes and wringing the snot out of them
I feel ya man! Going to Indy in June to celebrate the 50th year and reunion of Formula Ford racing (google it). I won the US Nationals a few times and really miss the incredible competition that comes with that class. Going to get to drive the car I won the championship in 1978. It's beenrestored to the exact livery and setup as when I drove it in '78.
That said, I leave the big noise at the track and not **** off the folks who "vote" lol.
I like to make noise just as much as the next guy but we are always being hassled due to all the open exhaust systems we insist keeps us alive because of that noise.
Consider most all these free breathing exhaust systems that would never qualify to meet noise restrictions at most race tracks now a days.
So, if it's too loud for race tracks it certainly aught to be considered too loud for most neighborhoods.
Bob
Bob, I tried to like the SEs. I was thinking the same way. You can come in at three in the morning and not worry about bothering the neighbors. When I got on the gas with the SEs it sounded to me like riding a Craftmans riding lawn mower.That and the need for speed. (I've had this thing since Sept.2016)
Well, speed won over. I drop in a 222 cam with exhaust. Man this thing scoots now. No more falling its face at 3500 rpms. It now rolls on to 5000 rpms with much ease and with authority. Yes I gave in. What can I say, I'm weak.
Darrell
Darrel how does it feel coming right off idle as far as torque. After this summers riding I was thinking the fuelmoto pipe and 222 it picks up a good deal of hp vs the 447 and a few lbs in tq what I've seen
To me removing the cat made a world of difference when it came to torque. and when i cut the cat open it looked very restrictive. Ill attach an image of what it looks like cut open. personally would never have a bike and not remove the cat with stock head pipes.
Increased torque feel, but not dyno'd?? Did it run good? no back fire pop and sounded good?
Darrel how does it feel coming right off idle as far as torque. After this summers riding I was thinking the fuelmoto pipe and 222 it picks up a good deal of hp vs the 447 and a few lbs in tq what I've seen
I lost a little down low. But, I don't have the air filter yet. I was told that it'll probably be another couple weeks. The filter should help a little more. And then a real dyno. It's definitely a mid range cam. It'll get me by until something better comes out. The power band is pretty sweet though. It doesn't fall on its face at 3500rpms.
Here's some info that might be helpful in evaluating how much impact the catalytic converter has on a 2017 CVO 117 engine.
According to the HD parts catalog the Stage IV CVO with the high flow exhaust is rated at 125hp/115ftlbs. The high flow HD exhaust still has a catalytic converter but it moves the cat from the headpipe to the mufflers.
I bought my CVO Limited last fall and wanted more performance but I also wanted to stick with HD parts. So i had my dealer install the Stage IV kit (64mm TB, 117cyl/pistons, 515cam, 5.5injectors, CNC ported heads). Plus I changed the mufflers to the freer flowing SE Street Cannons. But I still had the factory Cat headpipe plus the HD epa-rated tuning map that was flashed to the bike.
I took the bike to Fuelmoto and had them swap the factory headpipe for the FM Jackpot 2/1/2 ctuned headpipe. I kept my SE Street Cannons with the new headpipe. No other physical changes to the bike. (The new headpipe fits PERFECTLY under the factory headpipe cover). I then had Jamie at Fuelmoto dyno tune the bike using my Powervision.
The result: INCREDIBLE. Eliminating the cat headpipe completely eliminated the heat from my right foot. And I mean completely gone. As you can see in the before/after dyno below, the combination of the cat-free headpipe with a proper tune dramatically increased the performance. The performances went from 113/122 to 128/128. And remember HD dyned this engine with their own hi-flow cat exhaust at 125/115.
Conclusion: a cat free headpipe with a proper engine tuning can deliver more hp, more torque and complete removal of the dreaded right foot bake off.
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